02:12 — NASA's Fermi Gamma-Ray Space Telescope, which orbits Earth, has observed solar activity on the far side of the sun. How is that possible? Video footag (more…)
02:28 — The gamma ray burst has been described as the most colossal explosion in the universe. How does one form? If its beam of radiation hit Earth, how coul (more…)
01:37 — Explore the threats to Earth from supernovas, gamma-ray bursts, and stars that collide.
01:23 — They are so bright, they are a billion billion times more luminous than the sun. They are so distant, their light takes billions of years just to reac (more…)